Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e215d5d5e8f0ba5f093ac6c0602fb1347abf94bc09c67f03a96fa9523e2c0caf:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16